RHCE Containers and Podman 3

Question 1

What is a Pod in the context of Podman?

Accepted Answer

A group of containers sharing network and IPC namespaces

Answer

A Podman Pod is a group of containers that share a network namespace, IPC namespace, and optionally other namespaces, similar to a Kubernetes Pod.

Question 2

Which command creates a Pod named `mypod` with port 8080 exposed?

Accepted Answer

podman pod create --name mypod -p 8080:8080

Answer

`podman pod create --name mypod -p 8080:8080` creates a new Pod and configures port mapping on the infra container.

Question 3

What is the purpose of `skopeo` in a RHEL container workflow?

Accepted Answer

Inspects and copies container images between registries without running them

Answer

`skopeo` is a tool for inspecting, copying, and deleting container images in various registries without needing to pull them locally.

Question 4

What is `buildah` used for in the RHEL container toolchain?

Accepted Answer

Building and modifying OCI container images

Answer

`buildah` is a tool for building OCI-compliant container images, used as the build backend for Podman.

Question 5

How do you enable a Podman container to start automatically at system boot (as root)?

Accepted Answer

Generate a systemd unit with `podman generate systemd`, copy to `/etc/systemd/system/`, then `systemctl enable`

Answer

Generate the systemd unit file with `podman generate systemd`, place it in `/etc/systemd/system/`, and enable it with `systemctl enable --now`.

RHCE - Red Hat Certified Engineer Practice Test